Slip connection for dental bridgework.



E. ALLINGHAM.

SLIP CONNECTION FOR DENTAL BRIDGEWORK.

APPLICATION FILED MAR. 30. I918.

1,271,531 Patented Ju1 '9,1918.

ELLIOTT ALLING-I-IAM, 0F TORONTO, ONTARIO, CANADA.

SLIP CONNECTION FOR DENTAL BRIDGEWORK.

Specification of Letters Patent.

Patented July 9, 1918.

Application filed. March 30, 1918. Serial No. 225,740.

To all whom it may concern Be it known that I, ELLIOTT ALLINGHAM, dentalmechanic, of the city of Toronto, in the county of York, in the Provinceof Ontario, Canada, have invented certain new and useful Improvements inSlip Connections for Dental Bridgework, of which the following is aspecification.

My invention relates to improvements in slip connections for dentalbridge work, and the object of the invention is to devise a slip Iconnection whereby the removable bridge may be readily attached to theadjacent tooth or teeth and it consists essentially of a crown designedto be secured on the tooth and having a centrally grooved guide-wayattached thereto, and adjacent guide-ways at each side of said groovedguide-way and a bridge having a tongue designed to fit into the centraltongue of the crown and laterally extending tongues designed to fit ntothe grooves on each side of the central guideway of the crown, the partsbeing arranged and constructed in detail as hereinafter moreparticularly explained.

Figure 1 is a perspective view showing my bridge attached to the crown.

Fig. 2, is a view from another point.

Fig. 3, is an enlarged detail showing the connection between the crownand the end of the bridge.

Fig. 4 is a perspective detail of the end of the bridge showing thecrown removed.

Fig. 5, is a detail of the crown showing the guide-ways.

Fig. 6, is a longitudinal sectional view showing the connection betweenthe crown and the bridge.

Fig. 7 is a sectional plan showing the connection between the crown andthe bridge.

Fig. 8, is a detail of the guide-ways attached to the crown.

Fig. 9, is a detail of the tongues attached to the bridge.

In the drawings like characters of reference indicate correspondingparts in the various figures.

1 is the crown and 2 the bridge, which may be of any suitable formprovided with teeth 2 and the base which is adapted to fit the gum. Thecrown 1 is generally formed of gold and is provided with a groovedguide-way 3 having lateral projections 4L, which form guiding grooves 5at each side of the guide-way 3. The base of the bridge 2 is molded orformed up around a stem 6, which extends into the base as indicated inFigs. 6 and 7, and is turned up at the end into a vertical portion 6'forming a tongue.

The stem 6 is also provided with a bar 6 formed at the end into loops 6which end in inwardly extending lateral tongues 6 The crown, of course,is secured in the usual manner on the tooth to which the bridge is to beconnected and thetongue 6 with the lateral tongues 6 attached to thebridge 2 are pushed downward into the guiding grooves 3 and 5, whichthey fit closely and snugly when the bottom end of the tongue comesopposite the bottom of the guide-way 3.

Such a slip connection as I describe enables the brldge to be readilyinserted in position and not only this but the bridge just as readilyremoved, so that it may be cleaned.

The triple tongue formed by the central tongues and side tongues fittinginto the central guiding groove and side guiding grooves 5 form a veryrigid connection, and thereby maintain the bridge securely from lateraldisplacement and any rocking movement, which would make the bridgeuncomfortable.

Although I show my slip connection only attached to one end of thebridge it will, of course, be understood that it may be with equalfacility applied to a bridge extendlng between two crowned teeth, andthereby having the attachment at both ends of the bridge and on bothcrowns.

What I claim as my invention is.

1. In a slip connection for dental bridge work, the combination with acrown having a vertical guide-way held thereon, and adjacent guide-wayson each side of the main guide-way, of a bridge havin a vertical endtongue and laterally eXten ing tongues one on each side designed to slipinto and snugly fit the guide-ways in the crown.

2. The combination with a rown having a guide-Way formed in the centerof the eral extending tongues, the said tongues be-.

side and laterally projecting Wings forming ing adapted to fit into theguide-Ways 0n supplemental adjacent guide-Ways, of a the crown.

bridge. havingae stem providedwith va ver- ELLIOTT ALLI'NGHAM. ticalendportion and a bar on the inside Of Witnesses:

such end portion provided with bent ends EGAN,

forming a 1oop, the ends ofwhichiformlat- ""LIRZJ'MOFEAT; i i" Copies ofthis patent maybe obtained'for.five. .centsieaclgubyaddressing1h-t90ommissioner of Patents,

. Washington, D. G."

